Re: [Ekiga-list] speakerphone mode

[Damien Sandras <dsandras seconix com>]

Le mercredi 21 novembre 2007 à 09:41 +0000, Alan Lord a écrit :
> Damien Sandras wrote:
> 
> > 
> > That is a good idea.
> > 
> > 
> > Notice we could also reuse echo cancellation algorithms from Asterisk.
> 
> Hi, forgive the intrusion.
> 
> I had a similar idea a week or so ago but am not a software engineer. I 
> built and installed Asterisk on my LFS (Linux From Scratch) server. I 
> have a cheap analogue PSTN (x100p) card and the standard EC with the 
> Zaptel modules didn't do much - echo was bad...
> 
> I installed the OSLEC canceller from David Rowe 
> (http://www.rowetel.com/ucasterisk/oslec.html) which is simply a kernel 
> module that interfaces to the zaptel module. It is brilliant! Worked a 
> treat...
> 
> On my desk I use the Polycom Communicator (a handsfree combined 
> mic/speaker) USB audio device. And although most of the EC and noise 
> suppression technology is apparently in their Windows only drivers, it 
> works "OK" on my Ubuntu Desktop, but I do have some problems with echo.
> 
> I was wondering if it would be possible to use the OSLEC module in a 
> more "generic" way (perhaps within ALSA) so that it could be used to 
> provide EC services to almost any audio device or as a "driver" simply 
> for my Polycom C100s... Is this a sensible idea?

It is certainly worth having a look. The algorithm is probably good and
could certainly be used in ekiga.

However, I fear the module itself is probably very "zapata" specific and
thus not usable with standard sound applications.

Very interesting link though...
-- 
 _     Damien Sandras
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